Arbuscular mycorrhizal fungal hyphae mediating acidification can promote phytate mineralization in the hyphosphere of maize (Zea mays L.)

作者：Wang Fei; Jiang Rongfeng; Kertesz Michael A; Zhang Fusuo; Feng Gu^*

来源：Soil Biology and Biochemistry, 2013, 65: 69-74.

DOI：10.1016/j.soilbio.2013.05.010

• Ammonium
• Mycelium
• Phosphatases
• Organic phosphate
• Hydrolysis
• Phytin

Mycorrhizal and non-mycorrhizal maize (Zea mays L.) plants were grown in two-compartment rhizoboxes, in order to study the effect of mycorrhizal hyphae-mediated acidification on organic P mineralization in the hyphosphere. The soil in the two compartments was supplemented with either KNO3 or (NH4)(2)SO4, and phytin (0 or 75 mg P kg(-1)) was added to the hyphal compartment. P content in the shoots was significantly higher for the NH4+ treatment than for the NO3- treatment, but only in the combined presence of phytin and AM fungal mycelium (Rhizophagus intraradices). NH4+ treatment under these conditions also led to a decrease in hyphosphere pH, enhanced phosphatase activity in the hyphosphere and accelerated mineralization of phytin compared to the NO3- treatment. The results show that hyphosphere acidification induced by absorption of NH4+ by the AM fungal mycelium leads to an increase in phosphatase activity, and consequently enhances mineralization of phytin and improves maize uptake of P from phytin-P.

• 出版日期2013-10
• 单位中国农业大学